If they do not work then if you call 191 or use Live Chat they can ask their Nuc Department to supply you one and or you could try asking Samsung Customer services for the mastercodes although they can't help with unlocking the phone.

I'm sorry to see there's been a problem with the Network Unlocking Code (NUC) you've been provided @bmd. As the help offered by @BandOfBrothers hasn't resolved this, get in touch by following the link in the private message I've sent and we'll be able to look into this for you.